Look no further than the way they eat:
a) chewing with mouth open
b) talking with food in mouth
c) no napkin on their lap
d) not waiting for others to sit down
e) dragging the chairs
f) licking finger tips / smacking lips combo
g) unable to sit still
h) slurping
i) excess mastication sounds
Others:
1) flip flops in the work place
2) loud talking in closed corridors
3) voices that carry
4) uncontained outbursts that show a lack of self control
5) involuntary lip sounds in general
6) Not lisp(s) but "whisps". For instance when old ladies try to whisper but trailing sounds make a loud "whisp" which silently screeches across the whole room (i.e. not whispering). Worse if repeated every three minutes.
7) dragging their feet and not noticing they are making noise
8) walking four abreast a sidewalk without consideration for others. Same applies for trail etiquette when walkers don't look over their shoulders and clog the trail.
9) compulsive talking - domineering conversations or just going non-stop
10) excessive drinking to the point of talking about drinking during the work day
11) talking about lunch at 9:30AM
12) Not saying please or thank you
13) hard steps on the ground - boom boom boom
14) being unable to sit still in general but also edge-driven movements
15) loud what about bob sighs at the dinner table
I could go on...